AnswersPhysical ScienceSpeed and Velocity

Pretest Answers

10 verified answers
3

Mr. Smith is designing a race where velocity will be measured. Which course would allow velocity to accurately get a winner?

A
a 5 mile course from the center of town heading north to the outskirts of town
B
a 2 mile run around a 400 meter track
C
a 10 mile bike course that zigzags through the mountains and back again
D
a 100 meter swim in a 50 meter pool
4

Which is a valid velocity reading for an object?

A
45 m/s
B
0 m/s south
C
45 m/s north
D
0 m/s
5

Kiley went 5.7 km/h north and then went 5.8 km/h west. From start to finish, she went 8.1 km/h northwest. Which best describes her numbers?

A
5 point 7 km/h north and 5 point 8 km/h west are instantaneous speeds, while 8 point 1 km/h northwest is the average speed.
B
5 point 7 km/h north and 5 point 8 km/h west are average speeds, while 8 point 1 km/h northwest is the instantaneous speed.
C
5 point 7 km/h north and 5 point 8 km/h west are average velocities, while 8 point 1 km/h northwest is the instantaneous velocity.
D
5 point 7 km/h north and 5 point 8 km/h west are instantaneous velocities, while 8 point 1 km/h northwest is the average velocity.
6

Greg is in a bike race. At mile marker four (out of ten), his speed was measured at 13.5 mph. Which best describes the measured number?

A
It is the average velocity of the bike rider.
B
It is the instantaneous speed of the bike rider.
C
It is the instantaneous velocity of the bike rider.
D
It is the average speed of the bike rider.
7

Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track and it took her 6 minutes total to complete. Which best describes her speed and velocity? (There are 60 seconds in 1 minute.)

A
Her speed is 4 point 4 m/s , and her velocity is 0 m/s .
B
Her speed is 1 point 1 m/s , and her velocity is 0 m/s .
C
Her speed is 4 point 4 m/s , and her velocity is 4 point 4 m/s .
D
Her speed is 0 m/s , and her velocity is 2400 m/s .
8

Which best defines the relationship between speed and velocity?

A
Velocity is based on distance.
B
Velocity is speed with displacement.
C
Speed is velocity with displacement.
D
Speed is based on a specific direction.
9

Which explains the information needed to calculate speed and velocity?

A
Speed requires displacement, while velocity requires distance.
B
Both require the total distance, but velocity also requires time and displacement.
C
Both require time, but velocity requires displacement and speed requires distance.
D
Speed does not require time, while velocity does require time.

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